Battery charger



FIG. 1 is a front side perspective view of a battery charger showing thedesign;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is an end view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a side view thereof; and,

FIG. 6 is a top plan view of another embodiment thereof.

The ornamental design for a battery charger, as shown and described.